Method of finishing the exterior of fuse-closing caps.



I w. 1. HAWK-INS. METHOD pr FINISHING THE EIXTEEIOR 0F FUSE CLOSING CAPS.

APPLICATION FILED NOV- 21. um. 1,294,337

' Patent d Feb.'11,1919.

UNITED STATES PATENT OFFTQE.

WILFORDJUDSON HAWKINS, OFMONTGLAIR, NEW JERSEY, ASSIGNOR TO INTER NATIONAL ARMS AND FUZE COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

Specification of Letters Patent.

Patented Feb. 11, 1919.

Application filed November 21, 1917. Serial No. 203,151.

To all whom it may concern:

Be it known that I, VVILFORD JUDsON HAWKINS, a citizen of the United States, residing at Montclair, county of Essex, and State of New Jersey, have invented a new and useful Improvement in Methods of Finishing the Exterior of Fuse-Closing Caps,

' of which the following is a specification.

the interior of the fuse by the action of the air during projectile flight, which produces a partial vacuum in the channel to which the gases rush through the vents and from which they are discharged into the atmosphere. Heretofore, in the manufacture of such fuse closing caps, the channel has been undercut at an acute angle and the flange formed by this undercut channel has been slightly spun rearwardly to partially close said channel. This old method of finishing the caps was disadvantageous because it involved the use of a number of tools operating successively, and therefore involved loss of time in shifting the various tools into position for successive operation, and of course this loss of time added to the production cost. Applicant has discovered that the production cost and the time expended in production can both be materially reduced by making some of the operations simultaneously, and thereby simplifying the finishing operation as a whole. This is the main object of the present in vention. With this and other objects not specifically mentioned in view, the invention consists in certain methods which will be hereinafter fully described and then specifically set forth in the claims hereunto appended.

In the accompanying drawings, which form a partof this specification and in which like characters of reference indicate the same or like parts, Figure 1 is a diagrammatic plan view of a machine tool layout for carrying the invention into effect; Fig. 52 is a central cross-sectional view of a fuse closing cap, the interior of which has been finished by earlier operations and the exterior of which is to be finished by the present method; Fig. 3 is'a similar sectional view of the structure shown in Fig. 2 after a finishing cut over the whole exterior has been made and a flange has been formed thereon; Fig. 4 is a cross-sectional view of one of the tools used, taken on the line 4-4 in Fig. l; and Fig. 5 is a central cross-sectional view of the finished product.

In carrying the invention into efiect, two steps are necessarily involved; first, a tinished cut over the whole exterior of a fuse closing cap is made and simultaneouslyan annular channel is cut in the exterior of the cap adjacent its forward end and at right angles to its axis to form a thin flange; and second, the flange so formed is spun rearwardly over a portion of said channel. In the best constructions, a further step is taken which consists in simultaneously trimming the edgev of the spun flange and the rear I edge of the cap.

Referring to the drawings, 1 indicates diagrammatically the chuck of a turret lathe. and 2 indicates the turret of said lathe. Mounted upon the slide rest of the turret lathe not shown, is an undershot finishing tool 3, the operating edge of which is provided with a channel 4; lying between the flat cutting edges 5 and 6. The operating edge of the tool 3 is further provided with a curved surface 7 beyond the flat surface 6. The slide rest further carries trimming tools 8 and 9, the object of which will be hereinafter explained. Mounted in the turret 2 is a spinning tool 10, and it may be here remarked that although a turret was necessary in the practice of the old method of forming fuse closing caps, it is'not neces sary in the present method and the tail stock of an ordinary lathe will serve the purpose of holding the spinning tool 10 in position for its operation. In Fig. 2, 11 indicates a fuse closing cap, the interior of which has been finished, and the exterior of which is to be finished. The broken line in this figure indicates the original form of the slug from which the cap is formed. The metal originally lying between this broken line and the full line indicating the exterior of the cap in Fig. 2, is removed by a rough turning operation which may be considered a part of the present method or may be considered as a separate operation. The cap 11 is held in and turned vloy the chuck 1. The slide rest carrying the finishing tool 3. and the trimming tools 8 and 9 is then moved in the direction of the arrows in Fig. 1, to bring the tool 8 into contact with the cap. During this movement, the trimming tools 8 and 9 are of course moved-away from the cap 11. The tool 3 is an undershot tool opera-ting below the axis of the chuck 1 and cap 11. When its function is completed, the cap has the form shown in Fig. 8, and the Whole exterior or the cap is finished, leaving the flange 12 outstanding, as shown in Fig. 3.

The slide rest is then returned to its normal position so that the finishing tool Sand the trinnning tools 8 and 9 are in the position shown in Fig. l, and the spinning tool 10 is then moved into contact with the flange 12 and completes its function when the flange is spun rearwardlyover a portion-of said channel, or in other words to the position shown in Fig. 5.

The spinning tool is then moved out of contact with the cap and the slide rest is given a movement which simultaneously 'brings the trimming tool 8 into contact with the edge of the flange and the trimming tool 9into contact with the rear edge of the cap. These two tools serveto trim off any bur formed by thefinishing .tool 3 or the spinn'ingtool 1O ongthe edge of the flange 12 or the rear edge of the cap 11 By the use of this new method, time is saved and production cost reduced by simultaneously finishing the whole exterior of the cap l and cutting the channel to form the flange 12; and the 'difiiculties formerly encountered in cutting the channel at an acute angle are entirely overcome in the new method Where the channel is cut at right angles to the axis ofthe cap. Time is saved and production cost reduced further by the simultaneous tri'nnning action of the tools 8 and 9 andby the elimination of the necessity of rotatlng the turret containing a number of tools to Y operate successively upon the cap.

It will of course beund'erstood that the new method may be carried into eflect Without the use of the-particular type of machine tool used to illustrate one Way of carrying it into effect.

nular channel adjacent the forward-end of the cap at right angles to axisto form a thin flange, then spinning saidflange rearwardly over a, portion of said channel, and

then simultaneously trimming the edge of the spun, flange and the rear edgeof the cap.

3. The method of finishing the ,-.exterior or a fuse closing .cap which consists in roughly blocking out its exterior, then turning ofl a finishing cut over the whole exterior and simultaneously cutting an. annular channel adjacent the, forward endiof the cap at right anglesto its axis to form a thin flange, then spinning said flange rear-'- wardly over a portion of said channel, and then simultaneously trimming the v,edgerof the spun flange and the rear edge soft-the. i

cap. V

In testimony whereof, I have signed my name to this specification.

VVILFORD JUDSON HAWKINS.

fiopies of this patent may be obtained for five cents each, by addressing the Commissioner mfEatente,

Washingtonfi. is. 

